Khan Academy
Khan Academy: Draw Right, Acute, and Obtuse Angles
Create an acute, right, or obtuse angle using a given vertex.
CK-12 Foundation
Ck 12: Geometry: Angle Classification Grade 6
[Free Registration/Login may be required to access all resource tools.] Classify acute, right, obtuse, and straight angles.
CK-12 Foundation
Ck 12: Elem Math: Classifying Angles as Right, Acute, or Obtuse
[Free Registration/Login may be required to access all resource tools.] In this learning module, students are presented with angles and must identify what type each is. An accompanying video demonstrates a sample problem. [2:10] A set of...
CK-12 Foundation
Ck 12: Elem Math: Classifying Right Obtuse or Acute by Angle Measure
[Free Registration/Login may be required to access all resource tools.] Students watch a video and attempt practice problems on how to classify triangles based on angle measures.
Khan Academy
Khan Academy: Angle Types Review
Review the following types of angles: acute, right, obtuse, and straight. Identify and draw types of angles in some practice problems.
Math Is Fun
Math Is Fun: Angles
Definitions of different types of angles along with images and an interactive tool through which you can create acute, right, straight, obtuse, and reflex angles. View the parts of an angle, and learn the proper way to label angles.
Homeschool Math
Homeschool Math: Lines, Rays, and Angles
This fourth-grade geometry lesson teaches the definitions for a line, ray, angle, acute angle, right angle, and obtuse angle. We also study how the size of the angle is ONLY determined by how much it has "opened" as compared to the whole...
Texas Instruments
Texas Instruments: Classifying Angles
Students will create a variety of angles using the Geoboard APP. The teacher will use Screen Capture to display the angles created by the students and will lead a discussion on whether the angles are acute, right, or obtuse.
Shodor Education Foundation
Shodor Interactivate: Lesson: Angles (Elementary)
In this lesson students will learn what determines whether an angle is acute, obtuse or a right angle.
Math Open Reference
Math Open Reference: Angles
Everything you wanted to know about angles and more, including 1) how to measure angles 2) types of angles 3) angle relationships and 4) angles around a transversal.
Better Lesson
Better Lesson: Finding Angles
The three types of angles, right, acute, and obtuse, exist in our everyday surroundings. Young scholars find these angles using classroom items.
Khan Academy
Khan Academy: Recognize Angles
Determine if angles in shapes and pictures are acute, right, or obtuse. Students receive immediate feedback and have the opportunity to try questions repeatedly, watch a video or receive hints.
ClassFlow
Class Flow: Angles Votes
[Free Registration/Login Required] Using this flipchart, students will be able to identify various angles based on mathematical criteria. Questions are related to right, acute, and obtuse angles.
ClassFlow
Class Flow: Angle Tester
[Free Registration/Login Required] This flipchart reviews right, acute and obtuse angles with students. An Activote review is included at the end.
Shodor Education Foundation
Shodor Interactivate: Angles
The activity allows students to practice identifying different types of angles. An interactive activity and teacher resources are included.
Scholastic
Scholastic: Study Jams! Math: Geometry: Classify Angles
Watch and learn how to classify angles then test your knowledge.
Khan Academy
Khan Academy: Angle Types
In this exercise, students practice identifying angle types. Students receive immediate feedback and have the opportunity to get hints and try questions repeatedly.
Sophia Learning
Sophia: Complementary and Supplementary Angles
Complementary and Supplementary angles are explored in this tutorial video. [9:17] A PowerPoint presentation provides definitions of angle terms and a video offers examples for finding the missing angle in a supplementary or...
Shodor Education Foundation
Shodor Interactivate: Angles
This activity from Shodor Education Foundation will help you learn or review your angle vocabulary.
Quia
Ixl Learning: Types of Angles
Brush up on your math skills pertaining to types of angles then try some practice problems to test your understanding.
Khan Academy
Khan Academy: Angle Types
Determine if an angle is acute, right, or obtuse. A protractor is provided.
Khan Academy
Khan Academy: Angle Types
Determine if an angle is acute, right, or obtuse. A protractor is provided. Students receive immediate feedback and have the opportunity to try questions repeatedly, watch a video or receive hints.
Alabama Learning Exchange
Alex: Angle Scavenger Hunt
In this lesson, students will explore straight, right, acute, and obtuse angles. Students will go on a scavenger hunt throughout the school to search for examples of these types of angles. The students will use digital cameras to record...
University of Georgia
University of Georgia: Inter Math: Exterior Angles
Intermath Dictionary's site defines terms relating to angles, gives examples, and offers interactive exercises.